Solved E3D V5 filament jam

Please help me solve the mystery of filament jammed on retraction with E3D V5

Here is whats going on.
Filament gets retracted back into the nozzle about 2 mm.
Because of E3D design, upper part is cool so filament instantly hardens for some reasons at larger diameter (2.0mm or so) and wont go back down anymore because its cold stuck in the cooler part of the nozzle.

I keep getting this after upgrading to direct extruder.

I tried increasing or decreasing retraction distance, but it does not help.
Should i turn off the E3D radiator cooler off ?
Or did i design it to bee too efficient where it cools too much ?

 

OK found the problem.
I flipped the heating block upside down and it solved the issue. I can now retract far more and slower and it wont freeze and harden inside anymore.

 

I notice the ribbon cable going into where the hotend is, your design. Also the black enclosure with R1 on it, your design, looks very clean, where can I find it

 

My thingyverse link in signature field